Piezo-spectroscopic behavior of the emission bands of a-alumina in the 13900-14250 cm-1 spectral range

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Piezo-spectroscopic behavior of the emission bands of a-alumina in the 13900-14250 cm-1 spectral range

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Title: Piezo-spectroscopic behavior of the emission bands of a-alumina in the 13900-14250 cm-1 spectral range
Author: Abbasova, Rena; Visintin, S.; Sergo, V.
Abstract: The emission spectrum of a-alumina in the spectral range between 13900 and 14250 cm- 1 is characterized by several bands which are much weaker than the two intense and sharp R1 and R2 bands appearing at 14400 and 14430 cm-1, respectively;these latter are known as Ruby lines and they are the emission bands used in the Ruby laser. Furthermore these bands shift in frequency with stress (Piezo-Spectroscopic effect). In this paper/ for the first time, the stress-dependent peak frequency of the weaker bands in the 13900-14250 cm- 1 range is calibrated, and the results are presented as Piezo-Spectroscopic coefficients. The calibration is performed by reporting the frequency shift of each investigated band as function of varying stresses. The stresses/ residual in nature, are obtained by fabricating composite materials where a-alumina is mixed in various amounts with (i) Ceria-Stabilized Tetragonal Zirconia Polycrystals (Ce-TZP) and (ii) silicon carbide,SiC. The composite materials are prepared at high temperature (1500°-1800°C); due to the difference in thermal expansion, upon cooling to room temperature a-alumina develops compressive and tensile stresses/ when mixed with Ce-TZP and SiC, respectively. The stress values necessary for the calibration are obtained from the frequency shift of the R2 band/ using its well-established Piezo-Spectroscopic coefficient (7.6 cm- 1/GPa). Then the newly obtained Piezo-Spectroscopic coefficients of the bands in the 13900-14250 cm-1 range are tested to retrieve the stresses in two sets of composites; finally the stress values are compared with those obtained in the same samples from the frequency shift of the R2 band. The comparison shows a very good agreement, thus providing evidence that the bands in the 13900-14250 cm-1 range can be used to monitor stresses in a-alumina-based materials
URI: http://hdl.handle.net/123456789/1309
Date: 2005


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